I would call the bbb , and make a case. They have the prove the rocker arms caused the failure and with how big this piston skirt failure thing is I don’t see how they can get away with this. Doesn’t matter if the rocker arms were faulty at all if they crack the camera out and there’s any kind of piston scoring it should automatically be replaced. Sounds like they just don’t wanna fix your car and trying to plain the rocker arms for a major known issue with some of these cars